The 7 must-know numbers of the week

The amount of money billionaire John Van Lieshout has spent to expand his Noosa Heads retreat. The Van Lieshouts bought the neighbouring property in 1989 for $430,000.

NAB's share of the home loans market, according to the Royal Bank of Scotland. The bank says its aggressive "break up" campaign and lenders' fights to undercut each other have been a boon to business.

The percentage of people taking out a mortgage who opted for a fixed-rate product in September. This is up from 9.4% in August. Borrowers were swayed by banks and non-bank lenders fighting to undercut one another with ever-cheaper fixed-rate products.

The number of economists surveyed by the Australian Financial Review who expect interest rates to fall in the next six months. Five expect interest rates to rise in the next six months, and nine expect the cash rate to remain at 4.75%.

The number of Melbourne suburbs with median house prices of more than $1 million, according to RP Data. This is up from 36 last year.

The amount by which new unit approvals jumped in August compared with July, according to ABS figures.

The amount, in US dollars, that Friends star Matthew Perry hopes to secure for his Malibu home. Perry bought the property in 2005 for $6.5 million.